As far as District 1 goes, Mansfield is the much more established Councillor in the area, and she's earned a reputation of working hard for her constituents. It's kind of perplexing to me why Robinson would decide to challenge Mansfield, but he has done so and appears to be going through with the challenge. Robinson could have decided to move West and battle Janice McHenry or South and take on Marilyn Pfisterer. Instead, he's taking on one of the best Councillors on the Council.
I think one way or another, Robinson made a mistake. Either in the pre-primary convention or the May Primary, he'll find out that Mansfield is no slouch when it comes to a campaign.